What can a balloon symbolize(For a song I'm writing)?

This sounds like a terribly depressing song. Isn't music supposed to lift your spirits? Regardless, you may want to reconsider using the reference to 99 red balloons because there is a song out there called "99 Luftballons" and/or a lyric in that song makes reference to 99 red balloons. Use the Internet to glean more knowledge about that, or use the Search for questions feature near the top of the page with the appropriate key words. Someone here on YA not too long ago requested the words to this tune. Schools are about plagiarism or crediting the work of someone else as your own, and your music teacher should be aware of this and of that song. Anyway, a released helium balloon may represent freedom, or the journey of an innocent heartbroken child up to Heaven.